745202.fig.004a
(a)
745202.fig.004b
(b)
745202.fig.004c
(c)
745202.fig.004d
(d)
Figure 4: PL intensity as a function of concentration for 5 : 1 porphyrin : SWNT solutions for OEP (a, c) and TPP (b, d) show enhanced luminescence for composites. These solutions were photoexcited at the Soret band (a, b) (396 nm and 417 nm for OEP and TPP, resp.) and Q band (c, d) (529 nm and 590 nm for OEP and TPP, resp.) wavelengths. Measurements were performed in 2 mm quartz cuvettes for concentrations higher than 0.0003 mg/mL. A 1 cm quartz cuvette was used for all other measurements.